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Full text of "Tools"

Drilling an Accurate Hole in Exactly the Right Place 



MakejProjects 



Drilling an Accurate Hole in 
Exactly the Right Place 

Written By: Pat Delany 



SUMMARY 

This was originally meant to be a part of the 140+step concrete lathe project but it is too 
important to risk it getting buried. It was taught to me by a guy who has been an expert 
mechanic for over 70 years. 



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Drilling an Accurate Hole in Exactly the Right Place 



Step 1 — Drilling an Accurate Hole in Exactly the Right Place 



• To start your hole in metal, use a 
sharp scriber AND SCRIBE THE 
INTERSECTING LINES JUST ONE 
TIME. This is very important 
because it is difficult to re-scribe 
the line exactly. 

• Use a thin, very sharp punch 
(stupid program will not let me type 
prick punch but that is what it is) 
to lightly punch the intersection of 
the lines just one time. You should 
be able to slide the punch tip along 
the line and "feel" the line 
intersection. 

• Examine the punch mark in a bright 
light and if necessary "drift" (tilt the 
punch) the punch mark over (using 
the fine punch) to get it in exactly 
the right place. 

• Use a heavier, sharp punch to re- 
punch the smaller mark and make 
a dimple. Be careful here because 
sometimes a punch mark will work 
harden the metal and will actually 
be harder to drill than it should be. 

• Use a small bit to drill a pilot hole. 

• You may have to "step" drill with 
increasingly large bits to keep the 
hole on center. 

• Keep the drill absolutely vertical. 



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